Biology form 4 chap3 pt 3

1. The Movement
of Substances
Across the
Plasma
Membrane
3 . 3 - A p p r e c ia t in g
The M o ve m e nt o f
S u b s ta nc e s A c ro s s
t h e P la s m a
Me mbra ne

2. LEARNING
OUTCOMES
• Explain the necessity of
movement of substances across
the plasma membrane which
occurs in a continuous &
controlled manner for survival
of a cell

3. • Occurs in a continuous & controlled
manner for the survival of a cell.
• The fluidity of the plasma membrane
depends on the specific fatty acid &
cholesterol present and the temperature.
• Unsaturated fatty acids with bend tails
break up the dense fatty acid packing &
cause the phospholipids bilayer to be
more fluid.